Tuesday, November 6, 2007
152-9

A Study on Uptake and Translocation of the Soil Residual Pesticides into the Leaf and Root Vegetables.

Sang-Won Park, Byung-Jun Park, Jin-Kyoung Kim, Byung-Moo Lee, and Joung-Du Shin. National Institute of Agricultural Science and Technology, 249 Seodun-Dong, Suwon, 441-707, South Korea

The application amount of pesticide in Korea currently comes to around 12.7 a.i. kg/ha, and many peoples concern about the influence of pesticides to the environment and human health. Korea had held about 1300 registered pesticides, but doesn't have enough data on their environmental fates. A series of monitoring were conducted to evaluate the pesticide residue levels in the soil for past ten years. As a result, it selected with pesticides that had been significantly and frequently detected, to estimate the uptake and translocation of the soil residual pesticides. Leaf and root vegetables as radish etc., were grown in arable land applied with pesticides. The half-life of residues was prolonged with the following orders as Chlorfenapyr < Procymidone < Isoprothiolan < Endosulfan in loam soil. It was decided that there is a potential ability of its uptake and translocation in the post harvesting crop in case that Endosulfan being long half-life in the arable soil was applied with relatively short growing periods of upland crop. For uptake ratios of residual pesticides to the leaf and root vegetables, it was estimated that there were low with following orders as Ethoprophos > Chlorpyrifos >> Endosulfan > Fthalide in the loam soil. Also, it observed that order of absorbing the residual pesticides in soil to crops was great at Chinese cabbage > spinach > lettuce, and it was appeared that leafy radish nearly didn't absorb the pesticides. Potato and radish had similar pattern of absorbing their residues. Furthermore, the carrot with long period of growth and closed tissue had plentifully absorbed the pesticide residues from soil as compare to the radish and potato. Therefore, it was considered that there was necessary for potential ability to further detail countermeasure research that the residual amount of Endosulfan in carrot might be exceeded with the MRL.